Modification of mineral filler with organosilanes in a polymer composition for road marking

Currently, the use of polymer composite materials for road markings, in particular thermoplastics based on petroleum polymer resins, is promising. The effectiveness of the use of such road marking materials and their service life mainly depend on the formulations of thermoplastic compositions for marking and technologies for their production. The purpose of this work was to evaluate the adhesive interaction of microdolomite modified by organosilanes and thermoplastic petroleum polymer resin to impart increased operational properties of the road marking composition. To increase the adhesive affinity in the polymer system:filler it is proposed to modify the microdolomite with organosilane of the AGM-9 brand, which contains a hydrolyzable silicon-functional group and a non-hydrolyzable organofunctional group in the composition of the bifunctional molecule, which provides organofunctional properties to the inorganic surface of the filler. To create marking thermoplastics with a long service life in this work, it was proposed to use a combined combination of modified and unmodified microdolomite. It was discovered that the mixture of modified and unmodified microdolomite in the range of 10-15:85-90 leads to an increase in strength up to 7 MPa, which is higher than the permissible value of at least 5 MPa, while the ability to strain stretching and elongation at break decreases from 5 to 3%, which is also higher than the permissible value of at least 3%. The developed composite marking material based on domestic petroleum polymer resin and a combined filler of the MD40 brand with a combination of modified and unmodified microdolomite in a ratio of 12.5:87.5 has optimal strength-elasticity characteristics that meet the requirements for road marking materials and long-term abrasion resistance of up to 4 thousand cycles.